[PATCH] drm/plane-helper: Fix primary plane scaling check

[Daniel Vetter]

On Thu, Apr 10, 2014 at 02:18:06PM -0700, Matt Roper wrote:
> The src_w / src_h parameters to update_plane include a subpixel offset;
> we need to shift off the subpixel bits before comparing to CRTC size
> when checking for primary plane scaling.
> 
> Signed-off-by: Matt Roper <matthew.d.roper at intel.com>

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---
>  drivers/gpu/drm/drm_plane_helper.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c
> index e768d35..9eca283 100644
> --- a/drivers/gpu/drm/drm_plane_helper.c
> +++ b/drivers/gpu/drm/drm_plane_helper.c
> @@ -145,6 +145,8 @@ int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
>  	}
>  
>  	/* Disallow scaling */
> +	src_w >>= 16;
> +	src_h >>= 16;
>  	if (crtc_w != src_w || crtc_h != src_h) {
>  		DRM_DEBUG_KMS("Can't scale primary plane\n");
>  		return -EINVAL;
> -- 
> 1.8.5.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch